body {
    margin: 0;
}

h1 {
    text-align: center;
}

table, tr, td, th {
    margin: auto;
    border: 1px solid black;
    text-align: center;
}

button {
    display: block;
    text-align: center;
    border: 1px solid black;
    border-radius: 7px;
    text-align: center;
    margin: 5px auto;
    font-size: 15px;
    background-color: #498363;
}